The option Extra identifiers can be used to allow the balance of one wallet to be used from multiple passes.
This is useful when working with larger groups. For example you can give a group three passes to order products with, while all transactions are collected in a single overview.
The option can also be used to set rules such as allowing alcohol to be ordered until 17:00 with one pass and only after 17:00 with another pass.
An extra identifier often a pass or tag can just like a wallet be restricted by date and also by time. A pass or tag can also be limited so that for example beer and wine taps cannot be used until a certain time and can be used after that time with a different pass